387138557778 has 16 divisors (see below), whose sum is σ = 884888132160. Its totient is φ = 110611016496.

The previous prime is 387138557747. The next prime is 387138557779. The reversal of 387138557778 is 877755831783.

It is not an unprimeable number, because it can be changed into a prime (387138557779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4608792313 + ... + 4608792396.

It is an arithmetic number, because the mean of its divisors is an integer number (55305508260).

Almost surely, 2^387138557778 is an apocalyptic number.

387138557778 is an abundant number, since it is smaller than the sum of its proper divisors (497749574382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

387138557778 is a wasteful number, since it uses less digits than its factorization.

387138557778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9217584721.

The product of its digits is 276595200, while the sum is 69.

The spelling of 387138557778 in words is "three hundred eighty-seven billion, one hundred thirty-eight million, five hundred fifty-seven thousand, seven hundred seventy-eight".